Some of the mullions you are trying to place are too short for its types, and were not placed on the grid.

public static FailureDefinitionId SomeMullionsAreTooShort { get; }

Public Shared ReadOnly Property SomeMullionsAreTooShort As FailureDefinitionId
	Get

public:
static property FailureDefinitionId^ SomeMullionsAreTooShort {
	FailureDefinitionId^ get ();
}